How do I move the 2D cursor in Blender?
If I understand right, you want to rotate around selected point.
You can either move Origin point or the 3D cursor.
Moving Origin Point

Enable Transform Origins Only in Sidebar &gt; Tool &gt; Options
Move the object's origin to desired location


Moving 3D cursor

Position the 3D cursor using the 3D cursor tool.
Switch Pivot point to &gt; 3D Cursor